Hey Scott,
Thanks for the suggestion! However, we'd like to be able to have thousands of records for the grids we're using. The ComponentColumn is no replacement for an editor in this case, seeing that it renders a separate control for each cell. Or, as the author put it:

it is intended to be used in small grids where performance is not a problem

Is there really no simple way to connect a custom widget to the CellEditing plugin? Any widget, not just the CheckCombo. Sorry for being a bit off-topic here.